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HTEB1
User manual
Issue 0.2 Page 39 07/2002
3.3 SCI
SCI is used here for a simple RS232 (V24) terminal connection. Please use
a terminal program like HyperTerm (included in Windows), select
Baudrate 9600 Baud, 8 Databits, No Parity and 1 Stopbit (8N1). After
connection and setup, hit some keys and you will see a message
responding on every keycode sent.
/*
**-----------------------------------------------------------------------
**
** main.c - contains C entry point main()
**
** This file was generated by HEW IAR Icch8 project generator
**
**-----------------------------------------------------------------------
*/
#include "mydefs.h" // see file for further include
/* some defines */
#define TIE 0x80
#define RIE 0x40
#define TE 0x20
#define RE 0x10
#define MPIE 0x08
#define TEIE 0x04
#define CK_INT 0x00
#define CK_INT_OUT 0x01
#define CK_EXT 0x02
#define IS_SCI_RDF (SSR & 0x40)
#define CLEAR_SCI_RDF SSR = (SSR & ~0x40)
#define IS_SCI_TX_FREE (SSR & 0x80)
#define V24_BRR(x) ((unsigned char)(((CPU_CLK+16*x)/32/x) - 1))
void V24Init (u16 Baudrate)
{
SCR3 = 0x00; // disable all
SSR = 0x00; // clear all errorbits
SMR = 0x00; // 8N1 + /1 clock
BRR = V24_BRR(Baudrate); // set baud
PMR1 |= 0x02; // P22 = TxD Output
SCR3 = (TE|RE|CK_INT); // Ints und Data disabled, internal clock
}
u8 V24NewChar(void) // check for new char on V24
{
if (IS_SCI_RDF) // Receive buffer full?
{
return TRUE;
}
return FALSE;
}
u8 V24GetChar(u8* data) // simple GetChar via V24
{
u8 idx;
if (IS_SCI_RDF) // Receive buffer full?
{
*data = RDR; // yes, get data
CLEAR_SCI_RDF; // clear RDRF-Bit